Dash-pot.



H- ,E. TRENT.

DASH POT.

APPLICATION FILED SEPT- 30. 1 916.

1 ,%?U,@9@m Patented July 2,1918.

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Specification of Letters Patent.

Patented JA a, rare.

Appltcation filed September 30, 1916. Serial No. 123,292.

To all whom it may concern:

Be it known that 1, HAROLD E. TRENT, a subject of the King of England,and a resident of Murraysville, in the county of Westmoreland and Stateof Pennsylvania, have invented a ne and useful Improvement in Dash-Pots,of which the following is a specification. 1

My invention relates to time-element devices and particularly to dashpots.

The object of my invention is to provide a dash pot of the sucker typethat shall have means for easily varying the time period of itsoperation.

Heretofore, it has been customary to provide sucker dash pots withcooperating members and to rotate one with respect to the other to varythe area of engagement for the purpose of changing the time period ofoperationor the amount of retardation of the device to which it isconnected.

In my invention, I provide two cooperating members having substantiallyplane engagin surfaces. The movable member is provi ed with a partiallyclosed slit in its upper face for the reception of one end of anoperating rod. If the rod is so ositioned as to act upon the movingmember at its center, the operating time period of the device will. bethe greatest and the time period will decrease as the position of therod approaches the periphery of the movable memher.

In the accompanying drawings Figure 1' is a side view, partially insection and partially in elevation, of a device embodying my invention;Fig. 2 is a detail plan view of the dash pot embodying my invention, andFig.

3 is a view taken along the line TIL-III of Fig. 1.

An electromagnet, in connection with which my invention may be used,comprises a winding 1, a movable core member 2 and a supporting frame ormember 3. A member 4 of substantially U-shape is provided withlaterallyprojecting arms 5 for the purpose of slidably engaging thesupporting member 3. The member 4: is operatively connected to the covermember 6 of the dash pot 7. A positioning screw 8 and a nut 9 areprovided for clamping the member 4 in any desired position with respectto the supporting member 3. Thus, by varying the position of the member1 the movable core member 2 may be adapted to be actuated at differentvalues of current traversing the winding 1.

The dash pot 7 comprises the cover member 6, a fluid-containingreceptacle 10 having a substantially plane bottom 11 and a flanged upperportion 12 that is adapted to engage the cover member 6. A clampingmember 13, a screw 14: and a nut 15 are provided for the purpose ofsecuring the receptacle 10 in any desired position with respect to itscover 6. A rod 16 is secured to the lower end of the movable core member2 and is provided with an annular recess 18 near its lower end. A piston19 is adapted to cooperate with the bottom 11 of the receptacle 10 andis provided with a radial guideway or partially closed radial slot 20 onits upper face in which is disposed the enlarged lower end of the rod16.

When the rod 16 is disposed adjacent the center of the piston 19 themaximum eohesive action between the piston 19 and the surface of thebottom 11 is obtained. However, when the receptacle 10 is moved to suchposition that the rod 16 occupies a position such as is shown by brokenlines in Fig. 2 of the drawings, the movement of the core member 2 willnot cause the piston 19 to move in a plane parallel to the bottom 11,but will cause the pistor 1 19 to pivot around one of its edges, and,consequently, thetime required to separate the piston 19 and the bottom11 will be relatively short. Thus, by moving the receptacle 10 tovarious positions the rod 16 may be caused to assume such po- A sitionswith respect to the piston 19 and any desired time period may beobtained.

Theclamping member 13 may be adapted to serve as an indicator tocooperate with a scale (not shown) that may be marked on u 1. A dash potcomprising stationary and movable cooperating members and means forvarying the point of application of the actuating force of the movablemember for iii) the purpose of varying the time period of cooperationbetween the stationary and movable members.

2. A timee1ement device comprising stationary and movable cooperatingmembers, an actuating means for the movable member and means foroperatively connecting the actuating means to various positions on themovable member to vary the time period of operation thereof.

,3. The combination with two cooperating sucker dash-pot members, andmeans for moving one member with respect to the other, of means forvarying the position of the connection between the said means withrespect to its associated member.

4. A time-element device comprising two cooperating members havingsubstantially flat engaging surfaces, an actuating rod for one of themembers and means for operatively connecting the rod to various pointson the said member.

5. A dash pot comprising two cooperating members having engagingsurfaces, means for actuating the said members and means for soconnecting the actuating means to one of the said members that, when themembers are separated, the engaging surface thereof, may assume variousangles with respectto each other.

6. A dash pot comprising a receptacle having a substantially flat base,a piston therefor, said piston and receptacle being adapted to cooperatewith each other to secure a suction therebetwecn, an actuating rod forthe piston and means for connecting the rod in various positions withrespect to the piston to obtain a variable time period in the operationthereof.

7 In a time-element device, the combination with a receptacle having asubstantially.

flat bottom, of a piston therefor, and a rod for actuating the piston,said rod being adapted to be connected to different points on the pistonto obtain various adhesive actions between the receptacle and thepiston.

8. A dash pot comprising two cooperating members and means for soapplying a separating force thereto that the time required to separatethe same may be varied in accordance with the point of application ofthe said force.

9. A suction device comprising cooperating members, an actuating membernormally HAROLD E. TRENT.

